--- a/tests/test-command-template.t	Thu Oct 12 21:56:13 2017 +0900
+++ b/tests/test-command-template.t	Thu Oct 12 22:09:11 2017 +0900
@@ -3948,6 +3948,9 @@
   1 match rev
   0 not match rev
 
+  $ hg log -T '{ifcontains(desc, revset(":"), "", "type not match")}\n' -l1
+  type not match
+
   $ hg log --template '{rev} Parents: {revset("parents(%s)", rev)}\n'
   2 Parents: 1
   1 Parents: 0